I think you have to wait until the engineers set up a mine field. Then you can fall back to the second defensive position. I said I think because I usually play until I get tired of fighting, because I messed with the saved game file and now the engineers never finish with the mines. I could start a new game but I like having my tanks.
Changing things in one saved game has no effect on another. It is possible to mess up a saved game so that it will crash, but it can't hurt another save or a new game. Just make sure you backup your file first.
Glad to hear your using the reinforcement tip!
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